Flow Separation and Horseshoe Vortex in a Tube with Side Branches During Pulsatile Flow
Steady and pulsatile flow experiments were performed using a dog abdominal aorta that was made transparent and its glass model. Visualized flow patterns in both models were qualitatively similar. In front of the apex of each flow divider at branching sites, there appeared a bound vortex, the so-called horseshoe vortex. When the rate of flow to a branch decreased, separation of the flow occurred at the proximal outer wall of the branch artery. The region around the separation point experiences rather low wall shear stress while the horseshoe vortex will produce a high wall shear stress around the apex. An increase of the flow rate to the branch causes the flow to separate from the opposite wall of the branch orifice in the main trunk.
KeywordsWall Shear Stress Superior Mesenteric Artery Flow Separation Pulsatile Flow Vortex Formation
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